LTC3884EUK#PBF

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The LTC3884EUK#PBF is a current mode syncronous step-up DC/DC converter controller designed to operate from an input voltage of 4.5V to 38V. With the addition of an external MOSFET, inductor, and capacitor, the LTC3884EUK#PBF can step down or step up an input voltage for a required output voltage. It is a highly efficient, adjustable, synchronous-rectified step-up controller that is suitable for non-isolated DC/DC converters in various applications.

Application

The LTC3884EUK#PBF is suitable for a variety of non-isolated synchronous DC/DC applications such as PoE PD, laptop adapter, server, or telecom power supplies. It can also be used for Buck-Boost applications that require up to 97% efficiency. Other applications include notebook adapter, digital signage power supplies, and general point-of-load solutions.

Features

• Integrated power MOSFET gate drivers
• Output current limit
• Over-current protection
• Programmable UVLO
• Adjustable loop response
• Programmable soft-start/soft-stop
• Output voltage tracking
• Output overvoltage protection
• Power good output

Operating Principle

The LTC3884EUK#PBF works by sensing the voltage drop across the power MOSFET and then driving the MOSFET to regulate the output voltage. The controller uses the current mode control technique, which has the advantage of providing fast response and good dynamic stability. The output voltage is adjusted through the voltage sense resistor, and the output current is limited with the help of an integrated current-sense amplifier. The controller ensures a low start-up and holdup time by using a programmable soft-start/soft-stop function.

The loop response of the LTC3884EUK#PBF is adjustable. It is equipped with several protection features, such as undervoltage lockout (UVLO), output overvoltage protection (OVP) and overcurrent protection (OCP). The controller also features a power good output and a frequency foldback feature to keep the operating frequency at the optimum level and conserve power.

Conclusion

The LTC3884EUK#PBF is a highly efficient DC/DC switching controller suitable for non-isolated applications. It can be used for a variety of Buck-Boost or Step-up/Step-down applications, taking in an input voltage range between 4.5V - 38V, and providing 97% efficiency. It has several protection features, such as UVLO, OVP, and OCP, and the output voltage can be adjusted by the voltage sense resistor. The operating principle of the LTC3884EUK#PBF is current mode control, providing a fast response and good stability.

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